If a ball of mass 1 kg rolls with a speed of 2 m/s toward another ball of mass 1.5 kg at rest, what would be their combined speed if they stick together after colliding?

Question

asked Mar 10, 2021 14.7k views

1 Answer

Morris Franken · Answer 1 · 2021-03-16T08:18:45+0000

Answer:

$V=0.8\;\;m/s$

Step-by-step explanation:

Given,

Mass of first ball
$m_1=1\; kg$

Mass of second ball
$m_2=1.5\;kg$

Initial speed of the first ball
$u_1=2\;m/s$

The second ball is initially at rest. So, by the conservation of momentum

$p_i=p_f\\m_1u_1+m_2u_2=(m_1+m_2)V\\1*2+1.5*0=(1+1.5)V\\V=0.8\;\;m/s$